use【组件公共属性】
<div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; margin-top: 8px; margin-right: 8px; margin-bottom: 8px; margin-left: 8px; background-color: #ffffff;"><span style="line-height: 16px; white-space: normal;">语法apply="a-class-name"apply="class1, class2,..."apply="${EL_returns_a_class_or_a_collection_of_classes}"apply="${EL_returns_an_instance_or_a_collection_of_Composer_instances}"可以指定一个类、类的集合，apply用于初始化组件(译者注：详见use和apply的区别).该类必须实现 Composer接口 ，然后可以在doAfterCompose方法内做一些初始化工作, 因为该方法会在组件和其子组件初始化后自动调用（译者注：callback）
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